Bird movements

[Lisa Romano]

Wondering if anyone can recommend a resource that explains specific bird migrations at a finer scale. I'm familiar with the range maps that are easily found for each species but those high level maps don't explain the seasonal variations I observe. A good example of this is with the evening grosbeak. The range map in Merlin shows they are in the Willamette Valley year round and yet each spring for several weeks my feeders are full of them and then they're gone. Where do they go and where did they come from?  Over the years I've come to expect seasonal patterns in many species but those times when I'm not seeing them remain a mystery I'd love to learn more about. Thank you!

[nancy bee]

My best idea is eBird. Also Cornell’s “Birds of the world” is by subscription. I’ve forgotten the price. But it has very extensive information on any species of bird. Whole pages on diet, movement, migration etc. 

I’ve subscribed off and on since I learned about it. 

That might help you figure out where the evening grosbeaks are when they are not visiting you. 

Nancy Bee

“Every morning I awake torn between a desire to save the world and an inclination to savor it. This makes it hard to plan the day. But if we forget to savor the world, what possible reason do we have for saving it? In a way, the savoring must come first.”

  

E.B. White

On Oct 17, 2025, at 12:16 PM, Lisa Romano <lisam...@gmail.com> wrote:

Wondering if anyone can recommend a resource that explains specific bird migrations at a finer scale. I'm familiar with the range maps that are easily found for each species but those high level maps don't explain the seasonal variations I observe. A good example of this is with the evening grosbeak. The range map in Merlin shows they are in the Willamette Valley year round and yet each spring for several weeks my feeders are full of them and then they're gone. Where do they go and where did they come from?  Over the years I've come to expect seasonal patterns in many species but those times when I'm not seeing them remain a mystery I'd love to learn more about. Thank you!

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